Out of space Issues When Dowloading

My boss gets an "Out of Space" error when he tries to download a pdf file from our website, although he used to be able to. He has 14gb on his SD memory card. I have the same droid (cannot find version# anywhere on it, but it is the kind with the slidable keyboard); however, I CAN download. Looked into his default browser settings and could not find where cache can be set to the SD card like it can with my Dolphin browser. However, when we downloaded Dolphin on his Droid, he still could not download. Any suggestions?